861234121 has 4 divisors (see below), whose sum is σ = 939528144. Its totient is φ = 782940100.

The previous prime is 861234107. The next prime is 861234181. The reversal of 861234121 is 121432168.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 861234121 - 2²⁹ = 324363209 is a prime.

It is a super-2 number, since 2×861234121² = 1483448422349285282, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 861234121.

It is not an unprimeable number, because it can be changed into a prime (861234181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39146995 + ... + 39147016.

It is an arithmetic number, because the mean of its divisors is an integer number (234882036).

Almost surely, 2^861234121 is an apocalyptic number.

It is an amenable number.

861234121 is a deficient number, since it is larger than the sum of its proper divisors (78294023).

861234121 is a wasteful number, since it uses less digits than its factorization.

861234121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78294022.

The product of its digits is 2304, while the sum is 28.

The square root of 861234121 is about 29346.7906422491. The cubic root of 861234121 is about 951.4232115802.

Adding to 861234121 its reverse (121432168), we get a palindrome (982666289).

The spelling of 861234121 in words is "eight hundred sixty-one million, two hundred thirty-four thousand, one hundred twenty-one".